Dental mandrel



Oct. 18, 1927. 1,646,330

R. H. TAYLOR DENTAL MANDREL Filed Sept. 17, 1926 gnwniot licizmafam J6.733 101.

Patented Oct. 18, 1927.

PATENT OFFICE.

RICHARDSON H. TAYLOR, OF MEEKER, COLORADO.

DENTAL MANDREL.

Application filed September 17, 1926. Serial No. 136,079.

This invention relates to improven'ients in dental mandrels.

In the operation of grinding and polishing teeth dentists employ flatdisks of abrading material which are secured to suitable mandrels thatare rotated at high speed by means of electric motors. These flat disksare. however. unsatisfactory in many re- Fpects for they have verylittle rigidity and therefore flex very readily. This flexing of thedisk makes it impossible to exert any great amount of pressure whichslows the work and besides this the continual bending soon destroys thedisks. It is also evident that a flat grinding surface is not very welladapted for many different locations.

It is the object of this invention to produce a mandrel that is soconstructed that a sector shaped grinding disk can be clamped theretoand held in such a way that it will assume the shape of a cone. Thegrinding surface may be on the inside or on the outside as may bedesired. By forming the disk into a cone shape, it will be much morerigid and it will also be adapted to be employed in positions and inrelationships where flat disks can not be used.

In order better and more clearly to describe my invention so that itsconstruction and mode of operation can be understood, I shall havereference to the accompanying drawing where the preferred embodimentthereof has been illustrated and in which:

Fig. 1 is a view, with parts broken away. showing one way of using myimproved mandrel;

Fig. 2 is a "iew partly in section. showing the construction of myimproved mandrel and the manner in which the disk is secured in placethereto:

Fig. 3 is an end view of the mandrel, looking in the direction of thearrow 3 in Fig. 2; and

Fig. 4 is a view showing the shape of the disk employed.

Numeral 1 represents the shank of my improved mandrel. This mandreldiffers from the ordinary mandrel in this, that the head has an openingwith conical sides instead of the flat transverse face of the usualmandrel. As illustrated the head 2 is cone shaped and the outer conicalsurface terminates in the shoulder 3 and cylindrical surface 4. The endof the head portion has a conical depression terminating in a flattransverse bottom 5. The mandrel has a threaded axial opening 6extending inwardly from the bottom 5. A screw 7 extends into and has athreaded connection with the opening 6. This screw has a large head 8whose side is conical and parallel with the side of the opening in thehead 2. The grinding disk 10 is clamped between the inner wall of theopening in the head 2 and the side 9 of the head 8 in the manner shownin Fig. 2. The disk 10 may be made in the same manner and shape as theordinary flat disks now employed but must have a sector removed so as toform a sector-shaped opening 11. \Vhen the disk is in place on themandrel (Fig. 2) the radial sides 12 and 13 of the opening 11 overlapsomewhat as shown in Fig. 3 and care should therefore be exercised tooverlap the edges in such a way that the edge of the end in contact withthe object ground shall follow and not lead (see arrow in Fig. 3).

In Fig. 1 I have shown a tooth and indicated the same by the referencenumeral 14; this figure is intended to show one use of this device andillustrates how contact can be made with the tooth down to the gums.There are. of course. many other places where the cone shaped grindingsurfaces are superior to the flat ones now ordinarily employed and Fig.1 is therefore merely shown as an example.

Having now described my invention what I claim as new is:

1. A dental mandrel comprising a shank provided at one end wtih anintegrally formed head of larger diameter, said head having a depressionwith conical sides, said mandrel having a threaded axial openingextending inwardly from the bottom of the depression and a screwthreadedly connected with the side of the o enin said screw having ahead Whose si e is ormed by a conical surface which conforms in shape tothe inner surface of the depression and which is adapted to cooperatewith the latter to clamp and hold a grinding disk.

2. A dental mandrel having an enlarged head at one end, said head beingprovided with a conical recess, said mandrel having an opening extendinginwardly from the bottom of the recess and a. screw threadedly connectedwith the inner surface of said opening, said screw having a head with a.10

in place.

In testimony whereof I aifix my signacure.

RICHARDSON H. TAYLOR.

